package club.caihappy.server.config;

import club.caihappy.server.config.security.component.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;

import javax.swing.text.TabExpander;

/**
 * Created by DELL on 2022/10/6
 **/
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Value("${jwt.tokenHead}")
    private String tokenHead;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;

    /**
     * 添加这个Endpoint,这样在网页可以通过websocket连接上服务
     * 也就是我们配置websocket的服务地址，并且可以指定是否使用socketJS
     */
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        /*
         *1.将/ws/ep路径注册为stomp的端点，用户连接了这个端点就可以进websocket.通讯，支持socketJS
         *2.setAllowedOrigins("*"):允许跨域
         *3.withSockJS():支持socketJS访问
         */
        registry.addEndpoint("/ws/eq").setAllowedOrigins("*").withSockJS();
    }

    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ChannelInterceptor() {
            @Override
            public Message<?> preSend(Message<?> message, MessageChannel channel) {
                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
                //判断是否为连接，如果是，需要获取token，并且设置用户对象
                if (StompCommand.CONNECT.equals(accessor.getCommand())) {
                    String token = accessor.getFirstNativeHeader("Auto-Token");
                    if (!StringUtils.isEmpty(token)) {
                        String authToken = token.substring(tokenHead.length());
                        String username = jwtTokenUtil.getUsernameFromToken(authToken);
                        //如果token中存在用户名
                        if (!StringUtils.isEmpty(username)) {
                            UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                            //验证token是否有效，重新设置用户对象
                            if (jwtTokenUtil.validateToken(authToken, userDetails)) {
                                UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                                SecurityContextHolder.getContext().setAuthentication(usernamePasswordAuthenticationToken);
                                accessor.setUser(usernamePasswordAuthenticationToken);
                            }
                        }
                    }
                }
                return message;
            }
        });
    }

    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        //配置代理域，可以配置多个，配置代理目的地前缀为/queue,可以在配置域上向客户端推送消息
        registry.enableSimpleBroker("/queue");
    }
}
